Plumbing Problems in the UK? Ask a Plumber Now.
Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Has the boiler ever been serviced and if so, what was the service done?
Did they flush it also?
There are quite a few things that need to be checked. The PCB certainly could be the issue but it may be related to scale on the heat exchanger, fuel restriction, water flow restriction, flow sensor failure, venting or condensation drain blockage. The most suspect to me would be the fan pressure switch. There may be some dust or blockage in the tubing for the fan pressure switch or a crack in the tubing that is preventing the pressure switch to turn on the fan from remaining activated. You are also correct to not have anyone work on it who wants to replace parts as a repair. There is testing that can be done to determine exactly what the issue is.
If you call the manufacturer of the boiler they should be able to recommend qualified people in your area. There should be a customer service number in your manual.